... HT200,HT250,D400,E600,F9 Ductile iron manhole cover 1)ductile iron QT400/18,QT450/10, ... Grey iron:HT150,HT200,HT250,D400,E600,F9002)Loading weight of pressure:A15,B125,C250,D400,E600 ... covers and grates 2) We also produce drain cover using steel, stainless steel by electric welding and ... and Australian standards 4) Form and Sizes available: square, rectangle, round, from 200mm to 1200mm 5) Certificate ...